- Double-blind experiment: Source neither the participants nor the researchers know which participants belong to the control group (receiving either no treatment or a standard treatment) nor the test group. Only at the end of the experiment do the researchers learn which participants were which. Performing an experiment in double-blind fashion can greatly lessen the power of preconceived notions or physical cues (e.g., placebo effect, observer bias, experimenter’s bias) to distort the results by making researchers or participants behave differently from in everyday life.
- Control group: Source During an experiment, members of that group receive either no treatment or a standard treatment.
- Placebo: Source is a substance or treatment with no active therapeutic effect used as a medical treatment for its psychological effect called ” the placebo effect “.
- statistically significance: Source In statistical hypothesis testing, a result has statistical significance when it is very unlikely to have occurred given the null hypothesis, a default position where there is no relationship between two measured phenomena or no association among groups.